Thanks for your reply!
About point 3: maybe this could become a parameter, together with some of the other Twitter Search API options?
About 5: the wall is still online here: https://www.archaeologyandme.eu/en/twitterwall/ Please note that I removed the 3 hashtags limit and I added some text on top and an html auto reload every 30 seconds since it is running on an unattended computer with large screen attached.
I noticed yesterday many tweets with embedded photos are not coming through, and I wonder if it’s due to the automatic compatibility mode of the API call following the new extended mode introduced in Twitter in the last months.
Thanks for your help!